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multipart/form-data ：符合数据，告知浏览器表单中是符合数据（字符串，二进制文件）
text/plain：用于向服务器传输大量文本，效率高，但时安全性低，用于发送邮件表示表单传输的数据">
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application/x-www-fomr-urlencoded ：表示表单先服务器传输的文件数据。这是默认格式。(将表单的数据转成XML格式向服务器传输)
multipart/form-data ：符合数据，告知浏览器表单中是符合数据（字符串，二进制文件）
text/plain：用于向服务器传输大量文本，效率高，但时安全性低，用于发送邮件表示表单传输的数据">
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表单的enctype属性：
application/x-www-fomr-urlencoded ：表示表单先服务器传输的文件数据。这是默认格式。(将表单的数据转成XML格式向服务器传输)
multipart/form-data ：符合数据，告知浏览器表单中是符合数据（字符串，二进制文件）
text/plain：用于向服务器传输大量文本，效率高，但时安全性低，用于发送邮件表示表单传输的数据">



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                PHP - 文件上传 | 缩略图
              
            
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        <h1 id="文件上传"><a href="#文件上传" class="headerlink" title="文件上传"></a>文件上传</h1><hr>
<h3 id="表单的enctype属性："><a href="#表单的enctype属性：" class="headerlink" title="表单的enctype属性："></a>表单的enctype属性：</h3><ul>
<li><code>application/x-www-fomr-urlencoded</code> ：表示表单先服务器传输的文件数据。这是默认格式。(将表单的数据转成XML格式向服务器传输)</li>
<li><code>multipart/form-data</code> ：符合数据，告知浏览器表单中是符合数据（字符串，二进制文件）</li>
<li><code>text/plain</code>：用于向服务器传输大量文本，效率高，但时安全性低，用于发送邮件<br>表示表单传输的数据类型</li>
</ul>
<p><strong>表单文件域</strong></p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line"><span class="tag">&lt;<span class="name">form</span> <span class="attr">method</span>=<span class="string">"post"</span> <span class="attr">action</span>=<span class="string">""</span> <span class="attr">enctype</span>=<span class="string">"multipart/form-data"</span>&gt;</span></div><div class="line">		<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"file"</span> <span class="attr">name</span>=<span class="string">""</span>&gt;</span></div><div class="line">		<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"submit"</span> <span class="attr">name</span>=<span class="string">"button"</span> <span class="attr">value</span>=<span class="string">"上传"</span>&gt;</span></div><div class="line">	<span class="tag">&lt;/<span class="name">form</span>&gt;</span></div></pre></td></tr></table></figure>
<h3 id="超全局变量"><a href="#超全局变量" class="headerlink" title="超全局变量"></a><strong>超全局变量</strong></h3><p><code>$_FILES</code><br><code>$_FILES[][&#39;name&#39;]</code> ：上传文件名<br><code>$_FILES[][&#39;size&#39;]</code>    ：文件上传的大小</p>
<p><strong><code>$_FILES[][&#39;error&#39;]</code>    ：文件上传的错误号 0，1，2，3，4，6，7</strong></p>
<blockquote>
<p>UPLOAD_ERR_OK：值为 0，没有错误发生，文件上传成功。<br><code>UPLOAD_ERR_INI_SIZE</code> ： 值为 1，上传的文件超过了 php.ini 中 <code>upload_max_filesize</code> 选项限制的值。<br><code>UPLOAD_ERR_FORM_SIZE</code>：值为 2，上传文件的大小超过了 HTML 表单中 <code>MAX_FILE_SIZE</code> 选项指定的值。<code>&lt;input type=&#39;hidden&#39; name=&#39;MAX_FILE_SIZE&#39; value=&#39;2&#39;&gt;</code>,隐藏域必须在文件域前面才起作用。<br><code>UPLOAD_ERR_PARTIAL</code>：值为 3，文件只有部分被上传。<br><code>UPLOAD_ERR_NO_FILE</code>：值为 4，没有文件被上传。<br><code>UPLOAD_ERR_NO_TMP_DIR</code>：值为 6，找不到临时文件夹。PHP 4.3.10 和 PHP 5.0.3 引进。<br><code>UPLOAD_ERR_CANT_WRITE</code>：值为 7，文件写入失败。PHP 5.1.0 引进。</p>
</blockquote>
<p>补充：</p>
<blockquote>
<p>表单允许POST传输的最大值：<br><code>post_max_size = 8M</code></p>
</blockquote>
<p><strong><code>$_FILES[][&#39;type&#39;]</code>    ：上传文件格式，返回MIMIE格式 语法：类型/格式</strong><br><strong><code>$_FILES[][&#39;tmp&#39;]</code>    ：文件上传的临时目录</strong> </p>
<blockquote>
<p><code>upload_tmp_dir=&#39;F:\wamp\tmp&#39;</code>  临时目录地址</p>
</blockquote>
<p>php.ini 配置文件<br><code>file_uploads = On</code> 是否允许文件上传<br><code>max_file_uploads = 20</code> 同时最多允许上传20个文件</p>
<h3 id="move-uploaded-file-移动上传文件"><a href="#move-uploaded-file-移动上传文件" class="headerlink" title="move_uploaded_file()移动上传文件"></a><strong>move_uploaded_file()移动上传文件</strong></h3><p><code>bool move_uploaded_file ( string $filename , string $destination )</code><br><code>$filename</code>：上传的文件的文件名。<br><code>$destination</code>：移动文件到这个位置。</p>
<p><strong>常用函数</strong><br><code>bool is_uploaded_file ( string $filename )</code> — 判断文件是否是通过 HTTP POST 上传的<br><code>is_uploaded_file($_FILES[&#39;userfile&#39;][&#39;tmp_name&#39;])</code>：用来确保恶意的用户无法欺骗脚本去访问本不能访问的文件，例如 /etc/passwd</p>
<p><strong>文件名截取</strong><br>方法一：<code>strrchr($filename,&#39;.&#39;);</code> 从最后出现的点截取到末尾<br>方法二：pathinfo($filename); 通过文件路径返回文件信息</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div></pre></td><td class="code"><pre><div class="line"><span class="meta">&lt;?php</span></div><div class="line">$path_parts = pathinfo(<span class="string">'/www/htdocs/inc/lib.inc.php'</span>);</div><div class="line"></div><div class="line"><span class="keyword">echo</span> $path_parts[<span class="string">'dirname'</span>], <span class="string">"\n"</span>;</div><div class="line"><span class="keyword">echo</span> $path_parts[<span class="string">'basename'</span>], <span class="string">"\n"</span>;</div><div class="line"><span class="keyword">echo</span> $path_parts[<span class="string">'extension'</span>], <span class="string">"\n"</span>;</div><div class="line"><span class="keyword">echo</span> $path_parts[<span class="string">'filename'</span>], <span class="string">"\n"</span>; <span class="comment">// since PHP 5.2.0</span></div><div class="line"><span class="meta">?&gt;</span></div><div class="line">/www/htdocs/inc</div><div class="line">lib.inc.php</div><div class="line">php</div><div class="line">lib.inc</div></pre></td></tr></table></figure>
<blockquote>
<p>以上两种方法方法可以被伪装（强制修改文件扩展名）</p>
</blockquote>
<p>方法三：开启<code>fileinfo</code>扩展<code>extension_fileinfo.dll</code></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line">$finfo = finfo_open(FILEINFO_MIME); //创建finfo对象，用来匹配文件</div><div class="line">$info = finfo_file($finfo,&apos;F:/image.jpg&apos;);//通过对象匹配文件</div><div class="line">var_dump($info);//显示文件信息</div></pre></td></tr></table></figure>
<p>文件上传注意事项：</p>
<blockquote>
<p>上传文件的大小限制（文件上传<code>upload_max_filesize</code>、post大小<code>post_max_size</code>、表单隐藏域<code>&lt;input type=&#39;hidden&#39; name=&#39;MAX_FILE_SIZE&#39; value=&#39;2&#39;&gt;</code>,文件域之前）<br>文件格式验证的三种方法：<br>路径截取、pathinfo、fileinfo</p>
</blockquote>
<h3 id="生成唯一文件名"><a href="#生成唯一文件名" class="headerlink" title="生成唯一文件名"></a>生成唯一文件名</h3><p>time().rand(100,999).strrchr($path,’.’);</p>
<p>uniqid().strrchar($path,’.’);</p>
<blockquote>
<p><code>string uniqid ([ string $prefix = &quot;&quot; [, bool $more_entropy = false ]] )</code>,可选前缀<code>prefix</code>、基于当前时间微秒数的唯一ID。设置第二个参数<code>more_entropy</code>为<code>TRUE</code>，返回唯一ID更具唯一性。</p>
</blockquote>
<h3 id="优化文件上传"><a href="#优化文件上传" class="headerlink" title="优化文件上传"></a>优化文件上传</h3><figure class="highlight php"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div 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文件上传类</div><div class="line"> */</div><div class="line"><span class="class"><span class="keyword">class</span> <span class="title">UploadLib</span></span>&#123;</div><div class="line">    <span class="comment">//保存操作获取的错误信息</span></div><div class="line">    <span class="keyword">private</span> $error;</div><div class="line">    <span class="comment">//外部调用文件上传的错误信息</span></div><div class="line">    <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">getError</span><span class="params">()</span></span>&#123;</div><div class="line">        <span class="keyword">return</span> <span class="keyword">$this</span>-&gt;error;</div><div class="line">    &#125;</div><div class="line">    <span class="comment">/**</span></div><div class="line">     * 文件上传优化类</div><div class="line">     * <span class="doctag">@param</span>  array $file 文件上传获取的数组信息</div><div class="line">     * <span class="doctag">@return</span> string       上传文件的路径</div><div class="line">     */</div><div class="line">    <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">upload</span><span class="params">($file)</span></span>&#123;</div><div class="line">        <span class="comment">/**</span></div><div class="line">         * 验证错误信息，保存到私有属性中</div><div class="line">         */</div><div class="line">        <span class="keyword">if</span> ($file[<span class="string">'error'</span>]!==<span class="number">0</span>) &#123;</div><div class="line">            <span class="keyword">switch</span> ($file[<span class="string">'error'</span>]) &#123;</div><div class="line">                <span class="keyword">case</span> <span class="number">1</span>:</div><div class="line">                    <span class="keyword">$this</span>-&gt;error = <span class="string">"上传文件超过了配置文件中允许的最大值"</span>;</div><div class="line">                    <span class="keyword">break</span>;</div><div class="line">                <span class="keyword">case</span> <span class="number">2</span>:</div><div class="line">                    <span class="keyword">$this</span>-&gt;error = <span class="string">"上传文件超过了表单允许的最大值"</span>;</div><div class="line">                    <span class="keyword">break</span>;</div><div class="line">                <span class="keyword">case</span> <span class="number">3</span>:</div><div class="line">                    <span class="keyword">$this</span>-&gt;error = <span class="string">"只有部分文件上传，没有完全上传"</span>;</div><div class="line">                    <span class="keyword">break</span>;</div><div class="line">                <span class="keyword">case</span> <span class="number">4</span>:</div><div class="line">                    <span class="keyword">$this</span>-&gt;error = <span class="string">"没有文件被上传"</span>;</div><div class="line">                    <span class="keyword">break</span>;</div><div class="line">                <span class="keyword">case</span> <span class="number">6</span>:</div><div class="line">                    <span class="keyword">$this</span>-&gt;error = <span class="string">"找不到临时文件"</span>;</div><div class="line">                    <span class="keyword">break</span>;</div><div class="line">                <span class="keyword">case</span> <span class="number">7</span>:</div><div class="line">                    <span class="keyword">$this</span>-&gt;error = <span class="string">"文件写入失败"</span>;</div><div class="line">                    <span class="keyword">break</span>;</div><div class="line">                <span class="keyword">default</span>:</div><div class="line">                    <span class="keyword">$this</span>-&gt;error = <span class="string">"其它未知错误"</span>;</div><div class="line">                    <span class="keyword">break</span>;</div><div class="line">            &#125;</div><div class="line">            <span class="keyword">return</span> <span class="keyword">false</span>;</div><div class="line">        &#125;</div><div class="line">        <span class="comment">/**</span></div><div class="line">         * 验证文件类型</div><div class="line">         * <span class="doctag">@param</span> array $allow_types 允许上传的文件类型</div><div class="line">         * <span class="doctag">@param</span> resource $finfo MIME资源，用于finfo_file匹配需求</div><div class="line">         * <span class="doctag">@param</span> string $info 文件类型与编码信息的字符串</div><div class="line">         * <span class="doctag">@param</span> array $type_mime 截取mime文件类型</div><div class="line">         */</div><div class="line">        $allow_types = <span class="keyword">array</span>(<span class="string">"image/jpeg"</span>,<span class="string">"image/png"</span>,<span class="string">"image/gif"</span>);</div><div class="line">        $finfo = finfo_open(FILEINFO_MIME);</div><div class="line">        $info = finfo_file($finfo, $file[<span class="string">'tmp_name'</span>]);</div><div class="line">        $info_array = explode(<span class="string">';'</span>,$info);</div><div class="line">        $type_mime = $info_array[<span class="number">0</span>];</div><div class="line">        <span class="keyword">if</span> (!in_array($type_mime,$allow_types)) &#123;</div><div class="line">            <span class="keyword">$this</span>-&gt;error = <span class="string">"文件类型错误，不能上传"</span>.$type_mime.<span class="string">"类型的文件"</span>;</div><div class="line">            <span class="keyword">return</span> <span class="keyword">false</span>;</div><div class="line">        &#125;</div><div class="line">        <span class="comment">/**</span></div><div class="line">         * 验证文件类型</div><div class="line">         * <span class="doctag">@param</span> byte $file['size'] 上传文件的大小</div><div class="line">         * <span class="doctag">@param</span> byte $GLOBALS['config']['file']['allow_size'] 网站允许上传的文件大小</div><div class="line">         */</div><div class="line">        <span class="keyword">if</span> ($file[<span class="string">'size'</span>]&gt;$GLOBALS[<span class="string">'config'</span>][<span class="string">'file'</span>][<span class="string">'allow_size'</span>]) &#123;</div><div class="line">            <span class="keyword">$this</span>-&gt;error = <span class="string">"上传文件大小是:"</span>.number_format($file[<span class="string">'size'</span>]/<span class="number">1024</span>/<span class="number">1024</span>,<span class="number">2</span>).<span class="string">"M;超过了网站允许的最大值:"</span>.number_format($GLOBALS[<span class="string">'config'</span>][<span class="string">'file'</span>][<span class="string">'allow_size'</span>]/<span class="number">1024</span>/<span class="number">1024</span>,<span class="number">2</span>).<span class="string">"M"</span>;</div><div class="line">            <span class="keyword">return</span> <span class="keyword">false</span>;</div><div class="line">        &#125;</div><div class="line">        <span class="comment">/**</span></div><div class="line">         * 验证文件是否通过HTTP POST上传</div><div class="line">         */</div><div class="line">        <span class="keyword">if</span> (!is_uploaded_file($file[<span class="string">'tmp_name'</span>])) &#123;</div><div class="line">            <span class="keyword">$this</span>-&gt;error = <span class="string">"非法上传文件，必须通过HTTP上传"</span>;</div><div class="line">            <span class="keyword">return</span> <span class="keyword">false</span>;</div><div class="line">        &#125;</div><div class="line">        <span class="comment">/**</span></div><div class="line">         * 创建上传文件夹</div><div class="line">         * <span class="doctag">@param</span> array $type 拆分MIME类型文件类型与文件格式</div><div class="line">         * <span class="doctag">@param</span> string $folder_set 定义级联文件夹</div><div class="line">         * <span class="doctag">@param</span> string $folder_path 网站配置上传文件路径与级联路径后的全路径</div><div class="line">         * <span class="doctag">@param</span> string $file_name 上传文件重新生成的唯一文件名</div><div class="line">         * <span class="doctag">@param</span> string $file_path 文件全路径，包含文件名</div><div class="line">         */</div><div class="line">        $type = explode(<span class="string">'/'</span>, $type_mime);<span class="comment">//获取的文件类型与文件格式两个值</span></div><div class="line">        $folder_set = $type[<span class="number">0</span>].DS.$type[<span class="number">1</span>].DS.date(<span class="string">'Ym'</span>).DS;</div><div class="line">        $folder_path = $GLOBALS[<span class="string">'config'</span>][<span class="string">'file'</span>][<span class="string">'upload_path'</span>].DS.$folder_set;</div><div class="line">        $file_name = uniqid(<span class="string">''</span>,<span class="keyword">true</span>).<span class="string">'.'</span>.$type[<span class="number">1</span>];</div><div class="line">        $file_path = $folder_path.$file_name;</div><div class="line">        <span class="keyword">if</span> (!file_exists($folder_path)) &#123;</div><div class="line">            <span class="keyword">if</span> (!mkdir($folder_path,<span class="number">0777</span>,<span class="keyword">true</span>)) &#123;</div><div class="line">                <span class="keyword">$this</span>-&gt;error = <span class="string">"上传文件夹创建失败"</span>;</div><div class="line">                <span class="keyword">return</span> <span class="keyword">false</span>;</div><div class="line">            &#125;</div><div class="line"></div><div class="line">        &#125;</div><div class="line">        <span class="comment">//上传文件</span></div><div class="line">        <span class="keyword">if</span> (move_uploaded_file($file[<span class="string">'tmp_name'</span>], $file_path)) &#123;</div><div class="line">            <span class="keyword">return</span> $folder_set.$file_name;</div><div class="line">        &#125;<span class="keyword">else</span>&#123;</div><div class="line">            <span class="keyword">$this</span>-&gt;error = <span class="string">"文件上传失败"</span>;</div><div class="line">        &#125;</div><div class="line">    &#125;</div><div class="line">&#125;</div><div class="line"><span class="meta">?&gt;</span></div></pre></td></tr></table></figure>
<h3 id="多文件上传"><a href="#多文件上传" class="headerlink" title="多文件上传"></a>多文件上传</h3><p>表单命名以数组的形式，接收到的数据，按相同的<strong>属性</strong>组成一个索引数组</p>
<h1 id="缩略图"><a href="#缩略图" class="headerlink" title="缩略图"></a>缩略图</h1><hr>
<p><code>bool imagecopyresampled ( resource $dst_image , resource $src_image , int $dst_x , int $dst_y , int $src_x , int $src_y , int $dst_w , int $dst_h , int $src_w , int $src_h )</code><br>重采样拷贝部分图像并调整大小</p>
<blockquote>
<p>dst_image：目标图象连接资源。<br>src_image：源图象连接资源。<br>dst_x：目标 X 坐标点。<br>dst_y：目标 Y 坐标点。<br>src_x：源的 X 坐标点。<br>src_y：源的 Y 坐标点。<br>dst_w：目标宽度。<br>dst_h：目标高度。<br>src_w：源图象的宽度。<br>src_h：源图象的高度</p>
</blockquote>
<h1 id="等比缩略图"><a href="#等比缩略图" class="headerlink" title="等比缩略图"></a>等比缩略图</h1><hr>
<p>思想：按图的长宽比例进行比较，源图的比例大的为标准，短边进行等比压缩。</p>
<blockquote>
<p>压缩目标图边的长度=源图缩放边的长度*目标图标准边长度/源图标准边的长度</p>
</blockquote>
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&lt;blog.uiste.com&gt;</div><div class="line">** +-------------------------------------------</div><div class="line">*/</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Class ThumbLib 生成缩略图</div><div class="line"> */</div><div class="line"><span class="class"><span class="keyword">class</span> <span class="title">ThumbLib</span></span>&#123;</div><div class="line">    <span class="comment">//保存操作获取的错误信息</span></div><div class="line">    <span class="keyword">private</span> $error;</div><div class="line">    <span class="comment">//外部调用文件上传的错误信息</span></div><div class="line">    <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">getError</span><span class="params">()</span></span>&#123;</div><div class="line">        <span class="keyword">return</span> <span class="keyword">$this</span>-&gt;error;</div><div class="line">    &#125;</div><div class="line">    <span class="comment">/**</span></div><div class="line">     * 生成缩略图</div><div class="line">     * <span class="doctag">@param</span> string $src_path 源图路径资源</div><div class="line">     * <span class="doctag">@param</span> int $max_w 缩略图的最大宽度，若调用时不传递就直接使用配置文件的大小</div><div class="line">     * <span class="doctag">@param</span> int $max_h 缩略图的最大高度，同上</div><div class="line">     * <span class="doctag">@param</span> bool $is_ration 是否等比缩放</div><div class="line">     * <span class="doctag">@param</span> string $prefix 缩略图文件名前缀</div><div class="line">     * <span class="doctag">@return</span> string 返回缩略图路径</div><div class="line">     */</div><div class="line">    <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">thumb</span><span class="params">($src_path,$max_w=<span class="string">''</span>,$max_h=<span class="string">''</span>,$is_ratio=true,$prefix=<span class="string">'small_'</span>)</span></span>&#123;</div><div class="line">        $max_w = $max_w!=<span class="string">''</span> ? $max_w : $GLOBALS[<span class="string">'config'</span>][<span class="string">'file'</span>][<span class="string">'thumb_w'</span>] ;</div><div class="line">        $max_h = $max_h!=<span class="string">''</span>	? $max_h : $GLOBALS[<span class="string">'config'</span>][<span class="string">'file'</span>][<span class="string">'thumb_h'</span>] ;</div><div class="line">        $ext = strtolower(strrchr($src_path,<span class="string">'.'</span>));<span class="comment">//获取文件的后缀</span></div><div class="line">        $type = <span class="string">''</span>;</div><div class="line">        <span class="keyword">switch</span> ($ext) &#123;</div><div class="line">            <span class="keyword">case</span> <span class="string">'.jpg'</span>:</div><div class="line">                $type = <span class="string">'jpeg'</span>;</div><div class="line">                <span class="keyword">break</span>;</div><div class="line">            <span class="keyword">case</span> <span class="string">'.jpeg'</span>:</div><div class="line">                $type = <span class="string">'jpeg'</span>;</div><div class="line">                <span class="keyword">break</span>;</div><div class="line">            <span class="keyword">case</span> <span class="string">'.png'</span>:</div><div class="line">                $type = <span class="string">'png'</span>;</div><div class="line">                <span class="keyword">break</span>;</div><div class="line">            <span class="keyword">case</span> <span class="string">'.gif'</span>:</div><div class="line">                $type = <span class="string">'gif'</span>;</div><div class="line">                <span class="keyword">break</span>;</div><div class="line">            <span class="keyword">default</span>:</div><div class="line">                <span class="keyword">$this</span>-&gt;error = <span class="string">"不支持该文件类型"</span>.$ext;</div><div class="line">                <span class="keyword">return</span> <span class="keyword">false</span>;</div><div class="line">        &#125;</div><div class="line">        $open_fn = <span class="string">'imagecreatefrom'</span>.$type; <span class="comment">//拼接函数名</span></div><div class="line">        <span class="comment">// 创建缩略图画布</span></div><div class="line">        $dst_img = imagecreatetruecolor($max_w, $max_h);</div><div class="line">        <span class="comment">// 打开源图片资源</span></div><div class="line">        $src_path_all = $GLOBALS[<span class="string">'config'</span>][<span class="string">'file'</span>][<span class="string">'upload_path'</span>].DS.$src_path;</div><div class="line">        <span class="keyword">if</span>(!$src_img = $open_fn($src_path_all))&#123;</div><div class="line">           <span class="keyword">$this</span>-&gt;error = <span class="string">"源图路径错误或者不全"</span>;</div><div class="line">            <span class="keyword">return</span> <span class="keyword">false</span>;</div><div class="line">        &#125;</div><div class="line">        $src_w = imagesx($src_img);</div><div class="line">        $src_h = imagesy($src_img);</div><div class="line">        <span class="keyword">if</span> ($is_ratio) &#123;</div><div class="line">            <span class="keyword">if</span> ($src_w/$src_h&gt;$max_w/$max_h) &#123;</div><div class="line">                <span class="comment">#若源图的宽度较长，则等比缩放高度</span></div><div class="line">                $dst_w = $max_w;</div><div class="line">                $dst_h = $dst_w*$src_h/$src_w;</div><div class="line">            &#125;<span class="keyword">else</span>&#123;</div><div class="line">                <span class="comment">#如源图的高度较长，则等比缩放宽度</span></div><div class="line">                $dst_h = $max_h;</div><div class="line">                $dst_w = $dst_h*$src_w/$src_h;</div><div class="line">            &#125;</div><div class="line">        &#125;</div><div class="line">        <span class="comment">// 求目标图的坐标</span></div><div class="line">        $dst_x = (int)(($max_w-$dst_w)/<span class="number">2</span>);</div><div class="line">        $dst_y = (int)(($max_h-$dst_h)/<span class="number">2</span>);</div><div class="line">        <span class="comment">// 生成缩略图</span></div><div class="line">        imagecopyresampled($dst_img, $src_img, $dst_x, $dst_y, <span class="number">0</span>, <span class="number">0</span>, $dst_w, $dst_h, $src_w, $src_h);</div><div class="line">        <span class="comment">// 保存缩略图</span></div><div class="line">        $folderpath = dirname($src_path);<span class="comment">//获取目录地址</span></div><div class="line">        $filename = basename($src_path); <span class="comment">//获取文件名</span></div><div class="line">        $small_path = $GLOBALS[<span class="string">'config'</span>][<span class="string">'file'</span>][<span class="string">'upload_path'</span>].DS.$folderpath.DS.$prefix.$filename; <span class="comment">//缩略图的全路径</span></div><div class="line">        $save_fn = <span class="string">'image'</span>.$type;</div><div class="line">        $save_fn($dst_img,$small_path);</div><div class="line">        <span class="comment">// 关闭资源</span></div><div class="line">        imagedestroy($src_img);</div><div class="line">        imagedestroy($dst_img);</div><div class="line">        <span class="comment">// 返回缩略图保存路径</span></div><div class="line">        <span class="keyword">return</span> $folderpath.DS.$prefix.$filename;</div><div class="line">    &#125;</div><div class="line">&#125;</div><div class="line"><span class="meta">?&gt;</span></div></pre></td></tr></table></figure>

      
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